cregit-Linux how code gets into the kernel

Release 4.7 drivers/media/pci/cx23885/cx23885-ioctl.c

/*
 *  Driver for the Conexant CX23885/7/8 PCIe bridge
 *
 *  Various common ioctl() support functions
 *
 *  Copyright (c) 2009 Andy Walls <awalls@md.metrocast.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *
 *  GNU General Public License for more details.
 */

#include "cx23885.h"
#include "cx23885-ioctl.h"

#ifdef CONFIG_VIDEO_ADV_DEBUG

int cx23885_g_chip_info(struct file *file, void *fh, struct v4l2_dbg_chip_info *chip) { struct cx23885_dev *dev = video_drvdata(file); if (chip->match.addr > 1) return -EINVAL; if (chip->match.addr == 1) { if (dev->v4l_device == NULL) return -EINVAL; strlcpy(chip->name, "cx23417", sizeof(chip->name)); } else { strlcpy(chip->name, dev->v4l2_dev.name, sizeof(chip->name)); } return 0; }

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static int cx23417_g_register(struct cx23885_dev *dev, struct v4l2_dbg_register *reg) { u32 value; if (dev->v4l_device == NULL) return -EINVAL; if ((reg->reg & 0x3) != 0 || reg->reg >= 0x10000) return -EINVAL; if (mc417_register_read(dev, (u16) reg->reg, &value)) return -EINVAL; /* V4L2 spec, but -EREMOTEIO really */ reg->size = 4; reg->val = value; return 0; }

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int cx23885_g_register(struct file *file, void *fh, struct v4l2_dbg_register *reg) { struct cx23885_dev *dev = video_drvdata(file); if (reg->match.addr > 1) return -EINVAL; if (reg->match.addr) return cx23417_g_register(dev, reg); if ((reg->reg & 0x3) != 0 || reg->reg >= pci_resource_len(dev->pci, 0)) return -EINVAL; reg->size = 4; reg->val = cx_read(reg->reg); return 0; }

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static int cx23417_s_register(struct cx23885_dev *dev, const struct v4l2_dbg_register *reg) { if (dev->v4l_device == NULL) return -EINVAL; if ((reg->reg & 0x3) != 0 || reg->reg >= 0x10000) return -EINVAL; if (mc417_register_write(dev, (u16) reg->reg, (u32) reg->val)) return -EINVAL; /* V4L2 spec, but -EREMOTEIO really */ return 0; }

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int cx23885_s_register(struct file *file, void *fh, const struct v4l2_dbg_register *reg) { struct cx23885_dev *dev = video_drvdata(file); if (reg->match.addr > 1) return -EINVAL; if (reg->match.addr) return cx23417_s_register(dev, reg); if ((reg->reg & 0x3) != 0 || reg->reg >= pci_resource_len(dev->pci, 0)) return -EINVAL; cx_write(reg->reg, reg->val); return 0; }

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#endif

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